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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd56448d6aff14f1bce3fa7a8935f079e10ce9374c215226b19bab08a2698967' 
  AND token = 'QI9PZEmBDDs1YIjRYo3FN0dEUIi3DVMXnpxhcxTJe24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}